如图,
和
都是等边三角形,
,
分别是
,
的中点,连接
,
,
.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/e07d520b-7374-430e-979a-6440d9b89dc7.png?resizew=163)
(1)
;
(2)
是等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/16/e07d520b-7374-430e-979a-6440d9b89dc7.png?resizew=163)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9e37e71ced105f26fa0c91b00cdcfa1.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
更新时间:2023-01-13 21:04:25
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】模型建立:如图1,等腰直角三角形ABC中,∠ACB=90°,CB=CA,直线ED经过点C,过A作
于D,过B作
于E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/213da013-ebf1-40c2-a7cc-0e7bfc931111.png?resizew=473)
(1)求证:
;
(2)模型应用:
①已知直线
:y=﹣
x﹣4与y轴交于A点,将直线
绕着A点逆时针旋转45°至
,如图2,求
的函数解析式;
②如图3,矩形ABCO,O为坐标原点,B的坐标为(8,﹣6),A,C分别在坐标轴上,P是线段BC上动点,设PC=m,已知点D在第四象限,且是直线y=
上的一点,若△APD是不以点A为直角顶点的等腰直角三角形,请求出点D的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c388d0a3f0a8d9fb0b9576d00af225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5c60ab4cdefda079244161bb911a453.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/213da013-ebf1-40c2-a7cc-0e7bfc931111.png?resizew=473)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b49434f8c1d76a4927047155f746628.png)
(2)模型应用:
①已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
②如图3,矩形ABCO,O为坐标原点,B的坐标为(8,﹣6),A,C分别在坐标轴上,P是线段BC上动点,设PC=m,已知点D在第四象限,且是直线y=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f21dbe94fa3d04e5596e8325384f88e0.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】已知点P是Rt△ABC斜边AB上一动点(不与点A,B重合),分别过点A,B向直线CP作垂线,垂足分别为点E,F,点Q为斜边AB的中点.
(1)如图①,当点P与点Q重合时,AE与BF的位置关系是________,QE与QF的数量关系是________;
(2)如图②,当点P在线段AB上且不与点Q重合时,试判断QE与QF的数量关系,并说明理由.
(温馨提示:直角三角形斜边上的中线等于斜边的一半)
(1)如图①,当点P与点Q重合时,AE与BF的位置关系是________,QE与QF的数量关系是________;
(2)如图②,当点P在线段AB上且不与点Q重合时,试判断QE与QF的数量关系,并说明理由.
(温馨提示:直角三角形斜边上的中线等于斜边的一半)
![](https://img.xkw.com/dksih/QBM/2018/3/27/1911215318073344/1915896557699072/STEM/1ff428f1e855452180781d339dd36f56.png?resizew=246)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】在等边三角形
中,点
分别在边
上,且
,连接
交于点
.
(1)![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/21/1d2513e7-d9d9-45b6-a4b3-65c30f5a220a.png?resizew=488)
如图 1,求证:
;
(2)过点
作
于点
.如图2,若
,
,求
的长度;
(3)如图3,以
为一边作等边三角形
,连接
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cca04b2a2b61d62a809776670a60c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b0a3fa475b24f57ecd79c681259561.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/21/1d2513e7-d9d9-45b6-a4b3-65c30f5a220a.png?resizew=488)
如图 1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c503e29373e8d87134bdb46bd3912910.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/082292e52d5b734762cf9c139ee550bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a67a7bdbe76c8fc1f17fe299c57b9c00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d00e760bec2dc824fbb59beaa204a4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)如图3,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a5e0a51c9e14fb246b0ba0b231c1e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da4563b71c779a3384fc9b18406ad89.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知,
ABC中,AB=AC,AD⊥BC,将边AB绕点A顺时针旋转90°得线段AE,点E为点B的对应点,连接BE,EC,其中EC交射线DA于点F,连接BF.
(1)如图1,若∠ABC=60°,则BF与EC的位置关系是 ,∠BCE= .
(2)若∠ABC=α,(1)中的结论是否成立?若成立,用图2给出证明,若不成立,说明理由.
(3)如图3,若AF=
,FC=3,请直接写出BE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)如图1,若∠ABC=60°,则BF与EC的位置关系是 ,∠BCE= .
(2)若∠ABC=α,(1)中的结论是否成立?若成立,用图2给出证明,若不成立,说明理由.
(3)如图3,若AF=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280757052d9b68ac5b8dd95fcd329644.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/1c10499b-c60a-4238-86ef-52265063e034.png?resizew=472)
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